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Aquarium Advice FINatic
Well if they are nerite snails. They're not pests at all. They are fairly "expensive"as far as snails go. They really help your tank and don't breed in FW, even if they were to lay eggs they need SW to hatch. I would leave them in there or if you don't want snails just remove them and give them to someone!
Now if you see more snails appear then they aren't Nerites and you'd leave a lettuce in the tank and remove it when full of snails. Repeat to rid of all of them.
Now if you see more snails appear then they aren't Nerites and you'd leave a lettuce in the tank and remove it when full of snails. Repeat to rid of all of them.